Frederick Kortlandt, "Glottalic consonants in Sindhi and Proto-Indo-European" (页面存档备份,存于互联网档案馆). Counterarguments exist for his argument of no discernible substrate influence on the development of the specific Sindhi glottalization. See also Michael Witzel, "Substrate Languages in Old Indo-Aryan", Electronic Journal of Vedic Studies 1999 (存档副本(PDF). [2013-09-19]. (原始内容(PDF)存档于2013-09-21).).
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Frederick Kortlandt, "Glottalic consonants in Sindhi and Proto-Indo-European" (页面存档备份,存于互联网档案馆). Counterarguments exist for his argument of no discernible substrate influence on the development of the specific Sindhi glottalization. See also Michael Witzel, "Substrate Languages in Old Indo-Aryan", Electronic Journal of Vedic Studies 1999 (存档副本(PDF). [2013-09-19]. (原始内容(PDF)存档于2013-09-21).).
Frederick Kortlandt, "Glottalic consonants in Sindhi and Proto-Indo-European" (页面存档备份,存于互联网档案馆). Counterarguments exist for his argument of no discernible substrate influence on the development of the specific Sindhi glottalization. See also Michael Witzel, "Substrate Languages in Old Indo-Aryan", Electronic Journal of Vedic Studies 1999 (存档副本(PDF). [2013-09-19]. (原始内容(PDF)存档于2013-09-21).).